Merge pull request #539 from ShanGor/main

Added PostgreSQL implementation

examples/lightrag_zhipu_postgres_demo.py

@@ -0,0 +1,114 @@
+import asyncio
+import logging
+import os
+import time
+from dotenv import load_dotenv
+
+from lightrag import LightRAG, QueryParam
+from lightrag.kg.postgres_impl import PostgreSQLDB
+from lightrag.llm import ollama_embedding, zhipu_complete
+from lightrag.utils import EmbeddingFunc
+
+load_dotenv()
+ROOT_DIR = os.environ.get("ROOT_DIR")
+WORKING_DIR = f"{ROOT_DIR}/dickens-pg"
+
+logging.basicConfig(format="%(levelname)s:%(message)s", level=logging.INFO)
+
+if not os.path.exists(WORKING_DIR):
+    os.mkdir(WORKING_DIR)
+
+# AGE
+os.environ["AGE_GRAPH_NAME"] = "dickens"
+
+postgres_db = PostgreSQLDB(
+    config={
+        "host": "localhost",
+        "port": 15432,
+        "user": "rag",
+        "password": "rag",
+        "database": "rag",
+    }
+)
+
+
+async def main():
+    await postgres_db.initdb()
+    # Check if PostgreSQL DB tables exist, if not, tables will be created
+    await postgres_db.check_tables()
+
+    rag = LightRAG(
+        working_dir=WORKING_DIR,
+        llm_model_func=zhipu_complete,
+        llm_model_name="glm-4-flashx",
+        llm_model_max_async=4,
+        llm_model_max_token_size=32768,
+        embedding_func=EmbeddingFunc(
+            embedding_dim=768,
+            max_token_size=8192,
+            func=lambda texts: ollama_embedding(
+                texts, embed_model="nomic-embed-text", host="http://localhost:11434"
+            ),
+        ),
+        kv_storage="PGKVStorage",
+        doc_status_storage="PGDocStatusStorage",
+        graph_storage="PGGraphStorage",
+        vector_storage="PGVectorStorage",
+    )
+    # Set the KV/vector/graph storage's `db` property, so all operation will use same connection pool
+    rag.doc_status.db = postgres_db
+    rag.full_docs.db = postgres_db
+    rag.text_chunks.db = postgres_db
+    rag.llm_response_cache.db = postgres_db
+    rag.key_string_value_json_storage_cls.db = postgres_db
+    rag.chunks_vdb.db = postgres_db
+    rag.relationships_vdb.db = postgres_db
+    rag.entities_vdb.db = postgres_db
+    rag.graph_storage_cls.db = postgres_db
+    rag.chunk_entity_relation_graph.db = postgres_db
+    # add embedding_func for graph database, it's deleted in commit 5661d76860436f7bf5aef2e50d9ee4a59660146c
+    rag.chunk_entity_relation_graph.embedding_func = rag.embedding_func
+
+    with open(f"{ROOT_DIR}/book.txt", "r", encoding="utf-8") as f:
+        await rag.ainsert(f.read())
+
+    print("==== Trying to test the rag queries ====")
+    print("**** Start Naive Query ****")
+    start_time = time.time()
+    # Perform naive search
+    print(
+        await rag.aquery(
+            "What are the top themes in this story?", param=QueryParam(mode="naive")
+        )
+    )
+    print(f"Naive Query Time: {time.time() - start_time} seconds")
+    # Perform local search
+    print("**** Start Local Query ****")
+    start_time = time.time()
+    print(
+        await rag.aquery(
+            "What are the top themes in this story?", param=QueryParam(mode="local")
+        )
+    )
+    print(f"Local Query Time: {time.time() - start_time} seconds")
+    # Perform global search
+    print("**** Start Global Query ****")
+    start_time = time.time()
+    print(
+        await rag.aquery(
+            "What are the top themes in this story?", param=QueryParam(mode="global")
+        )
+    )
+    print(f"Global Query Time: {time.time() - start_time}")
+    # Perform hybrid search
+    print("**** Start Hybrid Query ****")
+    print(
+        await rag.aquery(
+            "What are the top themes in this story?", param=QueryParam(mode="hybrid")
+        )
+    )
+    print(f"Hybrid Query Time: {time.time() - start_time} seconds")
+
+
+if __name__ == "__main__":
+    asyncio.run(main())

lightrag/kg/postgres_impl_test.py

@@ -0,0 +1,125 @@
+import asyncio
+import asyncpg
+import sys
+import os
+
+import psycopg
+from psycopg_pool import AsyncConnectionPool
+from lightrag.kg.postgres_impl import PostgreSQLDB, PGGraphStorage
+
+DB = "rag"
+USER = "rag"
+PASSWORD = "rag"
+HOST = "localhost"
+PORT = "15432"
+os.environ["AGE_GRAPH_NAME"] = "dickens"
+
+if sys.platform.startswith("win"):
+    import asyncio.windows_events
+
+    asyncio.set_event_loop_policy(asyncio.WindowsSelectorEventLoopPolicy())
+
+
+async def get_pool():
+    return await asyncpg.create_pool(
+        f"postgres://{USER}:{PASSWORD}@{HOST}:{PORT}/{DB}",
+        min_size=10,
+        max_size=10,
+        max_queries=5000,
+        max_inactive_connection_lifetime=300.0,
+    )
+
+
+async def main1():
+    connection_string = (
+        f"dbname='{DB}' user='{USER}' password='{PASSWORD}' host='{HOST}' port={PORT}"
+    )
+    pool = AsyncConnectionPool(connection_string, open=False)
+    await pool.open()
+
+    try:
+        conn = await pool.getconn(timeout=10)
+        async with conn.cursor() as curs:
+            try:
+                await curs.execute('SET search_path = ag_catalog, "$user", public')
+                await curs.execute("SELECT create_graph('dickens-2')")
+                await conn.commit()
+                print("create_graph success")
+            except (
+                psycopg.errors.InvalidSchemaName,
+                psycopg.errors.UniqueViolation,
+            ):
+                print("create_graph already exists")
+                await conn.rollback()
+    finally:
+        pass
+
+
+db = PostgreSQLDB(
+    config={
+        "host": "localhost",
+        "port": 15432,
+        "user": "rag",
+        "password": "rag",
+        "database": "rag",
+    }
+)
+
+
+async def query_with_age():
+    await db.initdb()
+    graph = PGGraphStorage(
+        namespace="chunk_entity_relation",
+        global_config={},
+        embedding_func=None,
+    )
+    graph.db = db
+    res = await graph.get_node('"CHRISTMAS-TIME"')
+    print("Node is: ", res)
+
+
+async def create_edge_with_age():
+    await db.initdb()
+    graph = PGGraphStorage(
+        namespace="chunk_entity_relation",
+        global_config={},
+        embedding_func=None,
+    )
+    graph.db = db
+    await graph.upsert_node('"THE CRATCHITS"', {"hello": "world"})
+    await graph.upsert_node('"THE GIRLS"', {"world": "hello"})
+    await graph.upsert_edge(
+        '"THE CRATCHITS"',
+        '"THE GIRLS"',
+        edge_data={
+            "weight": 7.0,
+            "description": '"The girls are part of the Cratchit family, contributing to their collective efforts and shared experiences.',
+            "keywords": '"family, collective effort"',
+            "source_id": "chunk-1d4b58de5429cd1261370c231c8673e8",
+        },
+    )
+    res = await graph.get_edge("THE CRATCHITS", '"THE GIRLS"')
+    print("Edge is: ", res)
+
+
+async def main():
+    pool = await get_pool()
+    sql = r"SELECT * FROM ag_catalog.cypher('dickens', $$ MATCH (n:帅哥) RETURN n $$) AS (n ag_catalog.agtype)"
+    # cypher = "MATCH (n:how_are_you_doing) RETURN n"
+    async with pool.acquire() as conn:
+        try:
+            await conn.execute(
+                """SET search_path = ag_catalog, "$user", public;select create_graph('dickens')"""
+            )
+        except asyncpg.exceptions.InvalidSchemaNameError:
+            print("create_graph already exists")
+        # stmt = await conn.prepare(sql)
+        row = await conn.fetch(sql)
+        print("row is: ", row)
+
+        row = await conn.fetchrow("select '100'::int + 200 as result")
+        print(row)  # <Record result=300>
+
+
+if __name__ == "__main__":
+    asyncio.run(query_with_age())

lightrag/lightrag.py

@@ -85,8 +85,12 @@ ChromaVectorDBStorage = lazy_external_import(".kg.chroma_impl", "ChromaVectorDBS
 TiDBKVStorage = lazy_external_import(".kg.tidb_impl", "TiDBKVStorage")
 TiDBVectorDBStorage = lazy_external_import(".kg.tidb_impl", "TiDBVectorDBStorage")
 TiDBGraphStorage = lazy_external_import(".kg.tidb_impl", "TiDBGraphStorage")
+PGKVStorage = lazy_external_import(".kg.postgres_impl", "PGKVStorage")
+PGVectorStorage = lazy_external_import(".kg.postgres_impl", "PGVectorStorage")
 AGEStorage = lazy_external_import(".kg.age_impl", "AGEStorage")
+PGGraphStorage = lazy_external_import(".kg.postgres_impl", "PGGraphStorage")
 GremlinStorage = lazy_external_import(".kg.gremlin_impl", "GremlinStorage")
+PGDocStatusStorage = lazy_external_import(".kg.postgres_impl", "PGDocStatusStorage")
 
 
 def always_get_an_event_loop() -> asyncio.AbstractEventLoop:
@@ -297,6 +301,10 @@ class LightRAG:
             "Neo4JStorage": Neo4JStorage,
             "OracleGraphStorage": OracleGraphStorage,
             "AGEStorage": AGEStorage,
+            "PGGraphStorage": PGGraphStorage,
+            "PGKVStorage": PGKVStorage,
+            "PGDocStatusStorage": PGDocStatusStorage,
+            "PGVectorStorage": PGVectorStorage,
             "TiDBGraphStorage": TiDBGraphStorage,
             "GremlinStorage": GremlinStorage,
             # "ArangoDBStorage": ArangoDBStorage

requirements.txt

@@ -1,29 +1,38 @@
 accelerate
-aioboto3
+aioboto3~=13.3.0
-aiohttp
+aiofiles~=24.1.0
+aiohttp~=3.11.11
+asyncpg~=0.30.0
 
 # database packages
 graspologic
 gremlinpython
 hnswlib
 nano-vectordb
-neo4j
+neo4j~=5.27.0
-networkx
+networkx~=3.2.1
-ollama
+
-openai
+numpy~=2.2.0
+ollama~=0.4.4
+openai~=1.58.1
 oracledb
-psycopg[binary,pool]
+psycopg-pool~=3.2.4
+psycopg[binary,pool]~=3.2.3
+pydantic~=2.10.4
 pymilvus
 pymongo
 pymysql
-pyvis
+python-dotenv~=1.0.1
+pyvis~=0.3.2
+setuptools~=70.0.0
 # lmdeploy[all]
-sqlalchemy
+sqlalchemy~=2.0.36
-tenacity
+tenacity~=9.0.0
 
 
 # LLM packages
-tiktoken
+tiktoken~=0.8.0
-torch
+torch~=2.5.1+cu121
-transformers
+tqdm~=4.67.1
+transformers~=4.47.1
 xxhash